Relief-valve for liquid-sprayers.



L. A. ASPINWALL. L RELIEF VALVE PoR LIQUID SPRAYERS.

APPLICATION FILED AUG. 8, 1914.

1,133,785. Patented Mar.3 0,1915.

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LEWIS AUGUSTUS ASPINWALL, OF JACKSON, MICHIGAN, ASSIGNOR TO ASPIN WALLMANUFACTURING COMPANY, A CORPORATION OF MICHIGAN.

RELIEF-VALVE FOR LIQUID-SPRAYERS.

Specification of .Letters Patent.

Patented Mar. 30, 1915.

Continuation in part of application Serial N o. 788,556, led September8, 1913. This application led August 8, 1914. Serial No. 855,759.

To all whom 'it may concern:

Be it known that I, Lnwrs AUGUSTUS As- PINWALL, a citizen of the UnitedStates, residing at Jackson, in the county of Jackson and State ofMichigan, have invented an Improvement in Relief-Valves for Liquid-Sprayers, of which the followingis a specication.

My present invention relates to relief valves employed in connectionwith liquid sprayers for spraying plants and vines, such, for example,as tomato plants and potato vines, with a suitable liquid, for killinginsects which would otherwise infest and tend to destroy suchvegetation, the relief `or by-pass valve being employed in conjunctionwith a pump to care for the excess liquid not required at the nozzles ofthe sprayer. Heretofore this excess liquid has been taken care of invarious ways. For instance, as shown in Letters Patent No. 1,018,804,granted to me February 27, 1912, for liquid sprayers, a pipe connectionwas employed between the pressure chamber and the suction end of thepump, by which the excess liquid not required at the nozzles wasreturned directly to the pump. I now prefer to employ for this purpose aloose iitting relief or by-pass valve located interiorly of the barrelor liquid receptacle and adjustable exteriorly thereof and so connectedwith the pressure chamber that the excess liquid not required at thenozzles is returned to the barrel or liquid receptacle, as will behereinafter more particularly described.

In the drawing, Figure 1 is a central sectional side elevationillustrating my present invention. Fig. 2 is a central longitudinalfront elevation of the same, and Fig. 3 is a sectional elevationillustrating the relationship between the relief valve, the'barrel, andthe pump.

Referring to the drawing, 10 indicates a portion of a barrel or liquidreceptacle, such as iscommonly employed in liquid sprayers to which thisinvention relates. As is also customary in these devices, the pressurechamber 11 is employed and connected with the discharge end 12 of asuitable pump,

from which also a pipe 13 leads to the nozzles by which the spraying iseffected. Withln the barrel 10 I employ an elbow 14, made of cast ironor other suitable material, and one end 15 of this elbow is connected bya'pipe 16 to the pressure chamber 11, the pipeV 16, as illustrated inFig. 3, passing through one end of the barrel 10.

The elbow 14 is suitably connected to a bracket 17 having a flange 18,by means of which, together with a bolt 19, the elbow is secured inposition within the barrel. 20 indicates a cylinder, preferably made ofmetal, which is open-ended, provided at one end exterlorly with suitablescrew threads to engage the screw thread in the opposite end 21 of theelbow 14. In the cylinder 20, adjacent the end at which it is connectedto the elbow 14, are a plurality of ports 22 preferably arrangedcircumferentially of the cylinder. Within the cylinder 20 is a piston23, connected to which is a piston rod 24. The piston 23 is preferablyloosely mounted within the cylinder 20, there being approximately athirty-second of an inch play between the periphery of the piston andthe inner surface of the cylinder, so as to simplify the construction,reduce the cost of making and fitting these parts, and also to o bviatethe possibility of the piston becoming corroded and rendered immovablein the cylinder during periods when the apparatus is not in use.Altogether, the work-V ing is with less power and friction by reason ofthe absence of packing.

Suitably secured on the rod 24 is a memb er having a series of radiallydisposed ribs 25 fitting within the cylinder and providing forintervening spaces through which the liquid may pass. Also connected tothe lower or outer end of the rod 24 is a flange 26, provided atopposite sides with lugs 27 having suitable apertures in alinementtherein to receive a bolt 28, which passes through the apertures inthese lugs and also through apertures provided therefor adjacent theends of the yoke 29. The lugs 27 are so spaced as to fit within the yoke29, and these parts are secured in position by means of cotter pins 30,which pass through the bolt 28 eXteriorly of the members of the yoke orby other similar devices. The members of the yoke 29 span the cylinder20 and also the elbow 14,

above which and in alinement with the cyl# inder, a rod 31V is suitablyconnected to the yoke. This rod 31 passes through an open-V ing providedtherefor in the wall of the barrel 10, and extends an appreciabledistance from the outer'surface of the barrel. i

32 designates a support base which, as illustrated, is secured to theouter surfaceof the barrel by means of a bolt 33, and extends preferablyat an inclination from the barrel. y34 is a bracket which is connectedto the support Vbase bybolts 35, or otherwise, and the free end of thebracket 34 preferably extends in a direction at right angles to andlapproximately directly above the rod 31. Onthe support base 32, thereare lugs 36. A' lever 37 is pivotally connected at one end to. theselugs 36, and the upper end of the vrod 31 is pivotally connected to thelever 37 by means of a bolt 38. I also employ a spring, preferably ahelical spring 39, one end of which is connected With an eyey 40, in thefree end of the lever 37, and

the other end of which is connected with.

an eye 41, in one end of an adjustingscrew 42, which passes through thebracket 34 and on the opposite side thereof is provided with a thumb nut43.

',Asfwill be readily understood, the action of the spring 39 maintainsthe piston 23 in its normal position through the lever 37, the rod 31,the yoke 29, and the members connecting the same with the piston rod 24,andthat upon the accumulation of an excess pressure in the pressurechamber 11, the surplus liquid will pass from the discharge end of thepump, through the pipe 16, and the pressure will force the piston tomove sufiiciently to open the ports 22 through which, as well as throughthe open free, end of the cylinder, this liquid may now pass and so bereturned to the barrel. It will furthermore be apparent that thepressure at which the piston is operated may be regulated by adjustingthe tension on the spring 39 through the adjusting screw 42.

and the thumb nut 43, it being understood that with a greater tension onthe spring'39 more pressure will be required to operate the piston, andvice versa, and by this means the pressure at the nozzles may beregulated when the pump is substantially constant.

I claim as my invention:

1. In a relief valve and in combination, a support, a'headfixed in thesaid support and provided-with an inlet'and an outlet connection,`between which there is always affreepassage, a cylinder secured inandvv extending from the said outlet connection and provided adjacentthereto withI a series of discharge ports, aV piston fitting looselywithin the cylinder and normally lying ad- -adjustably vconnecting thesame to the said' Y support exteriorly of the cylinder for.. regu.-

latingthepressure at which 'the piston will operate to control theextent to which the said ports are opened by thesame.

In az reliefvalve and in combination, asupport, a'head fixed in the saidsupport and provided with an inlet and an outlet connection, a cylindersecured in the said outlet connection and provided adjacent` theretowith aseries of circularly arranged discharge ports, a piston fittinglooselywithf" in the cylinder normally placed between the said dischargeports andthe said outletconnection, a rod connected to the piston, aflange. connected to the rod eXteriorly of the opposite end of thecylinder, Ya member. pivotally connected to the saidflange, and meanslconnecting the said member to the jacent the said outlet connection andbetween said support for regulating the pressure atV 3; -In a reliefvalve, and.V 1n a support, a headsecuredto the said sup-V port, an inletconnection in the said head, a` cylinder fixed in the said head-and eX-tending` therefrom and provided With a sefY ries of ports .adjacent thesaid head, a pis? ton fitting loosely within they cylinder, a piston rodconnectedto thepiston, a flange connected to the said piston `rodexteriorly of the cylinder at the free end thereof, lugs connected tothe said flange, a yoke pivotally connectedto the said lugs and spanningthe said cylinder, and adjustable means connecting the said yoke to thesaid support for normally` maintainingV the said yoke, fiange, rod andpiston in position and regu@ combination,

lating` the pressure at which the said'piston will operate.

4. In a relief'valve, and in combination, a support, a headfsecured tothe said support, an inlet .connection in the said head, a cylinderfixed in the said head and eXtendi ing therefrom and provided with aseries-l the said cylinder, a rod connected to the piston in positionand regulating the pressadyoke, a lever pvotally connected to the sureat which the said piston will operate. end of the said rod, a bracketsecured to the Signed by ine this 5th day of Aug. 1914. 10

said support, and a spring connected be- LEWIS AUGUSTUS ASPINWAL. tweenthe said bracket and the free end of Witnesses :4

the said lever for normally maintaining GEO. N. WHITNEY,

the said rod, yoke, ange, piston rod and F. B. CHANDLER.

Copies of this patent may be obtained for ve cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

